Erster Commit

2026-08-22 08:40:29 +02:00
commit 875477d425
1961 changed files with 930336 additions and 0 deletions
@@ -0,0 +1,122 @@
+import { decode as base64url } from '../../runtime/base64url.js';
+import verify from '../../runtime/verify.js';
+import { JOSEAlgNotAllowed, JWSInvalid, JWSSignatureVerificationFailed } from '../../util/errors.js';
+import { concat, encoder, decoder } from '../../lib/buffer_utils.js';
+import isDisjoint from '../../lib/is_disjoint.js';
+import isObject from '../../lib/is_object.js';
+import { checkKeyTypeWithJwk } from '../../lib/check_key_type.js';
+import validateCrit from '../../lib/validate_crit.js';
+import validateAlgorithms from '../../lib/validate_algorithms.js';
+import { isJWK } from '../../lib/is_jwk.js';
+import { importJWK } from '../../key/import.js';
+export async function flattenedVerify(jws, key, options) {
+    if (!isObject(jws)) {
+        throw new JWSInvalid('Flattened JWS must be an object');
+    }
+    if (jws.protected === undefined && jws.header === undefined) {
+        throw new JWSInvalid('Flattened JWS must have either of the "protected" or "header" members');
+    }
+    if (jws.protected !== undefined && typeof jws.protected !== 'string') {
+        throw new JWSInvalid('JWS Protected Header incorrect type');
+    }
+    if (jws.payload === undefined) {
+        throw new JWSInvalid('JWS Payload missing');
+    }
+    if (typeof jws.signature !== 'string') {
+        throw new JWSInvalid('JWS Signature missing or incorrect type');
+    }
+    if (jws.header !== undefined && !isObject(jws.header)) {
+        throw new JWSInvalid('JWS Unprotected Header incorrect type');
+    }
+    let parsedProt = {};
+    if (jws.protected) {
+        try {
+            const protectedHeader = base64url(jws.protected);
+            parsedProt = JSON.parse(decoder.decode(protectedHeader));
+        }
+        catch {
+            throw new JWSInvalid('JWS Protected Header is invalid');
+        }
+    }
+    if (!isDisjoint(parsedProt, jws.header)) {
+        throw new JWSInvalid('JWS Protected and JWS Unprotected Header Parameter names must be disjoint');
+    }
+    const joseHeader = {
+        ...parsedProt,
+        ...jws.header,
+    };
+    const extensions = validateCrit(JWSInvalid, new Map([['b64', true]]), options?.crit, parsedProt, joseHeader);
+    let b64 = true;
+    if (extensions.has('b64')) {
+        b64 = parsedProt.b64;
+        if (typeof b64 !== 'boolean') {
+            throw new JWSInvalid('The "b64" (base64url-encode payload) Header Parameter must be a boolean');
+        }
+    }
+    const { alg } = joseHeader;
+    if (typeof alg !== 'string' || !alg) {
+        throw new JWSInvalid('JWS "alg" (Algorithm) Header Parameter missing or invalid');
+    }
+    const algorithms = options && validateAlgorithms('algorithms', options.algorithms);
+    if (algorithms && !algorithms.has(alg)) {
+        throw new JOSEAlgNotAllowed('"alg" (Algorithm) Header Parameter value not allowed');
+    }
+    if (b64) {
+        if (typeof jws.payload !== 'string') {
+            throw new JWSInvalid('JWS Payload must be a string');
+        }
+    }
+    else if (typeof jws.payload !== 'string' && !(jws.payload instanceof Uint8Array)) {
+        throw new JWSInvalid('JWS Payload must be a string or an Uint8Array instance');
+    }
+    let resolvedKey = false;
+    if (typeof key === 'function') {
+        key = await key(parsedProt, jws);
+        resolvedKey = true;
+        checkKeyTypeWithJwk(alg, key, 'verify');
+        if (isJWK(key)) {
+            key = await importJWK(key, alg);
+        }
+    }
+    else {
+        checkKeyTypeWithJwk(alg, key, 'verify');
+    }
+    const data = concat(encoder.encode(jws.protected ?? ''), encoder.encode('.'), typeof jws.payload === 'string' ? encoder.encode(jws.payload) : jws.payload);
+    let signature;
+    try {
+        signature = base64url(jws.signature);
+    }
+    catch {
+        throw new JWSInvalid('Failed to base64url decode the signature');
+    }
+    const verified = await verify(alg, key, signature, data);
+    if (!verified) {
+        throw new JWSSignatureVerificationFailed();
+    }
+    let payload;
+    if (b64) {
+        try {
+            payload = base64url(jws.payload);
+        }
+        catch {
+            throw new JWSInvalid('Failed to base64url decode the payload');
+        }
+    }
+    else if (typeof jws.payload === 'string') {
+        payload = encoder.encode(jws.payload);
+    }
+    else {
+        payload = jws.payload;
+    }
+    const result = { payload };
+    if (jws.protected !== undefined) {
+        result.protectedHeader = parsedProt;
+    }
+    if (jws.header !== undefined) {
+        result.unprotectedHeader = jws.header;
+    }
+    if (resolvedKey) {
+        return { ...result, key };
+    }
+    return result;
+}